Is there a way (through a console or via umod plugins) to access items prefabs paramters? For example, Flasherlight (electric.flasherlight), I can access ItemDefinition parameters (such as shortname, id, etc.) , but ItemModDeployable (such as entityPrefab or showCrosshair can't be retrieved). 

I refrenced ItemManager.itemList (var items = ItemManager.itemList;) and then item.displayName.shortname
 

what exactly do you need?

You nedd to do

get item -> get definition -> then
itemDefinition.GetComponent<ItemModDeployable>()

Great thank you Orange!